Olá,
I bought my 3 sets from Pro-Lox in the Netherlands. The seller is active here too, his name is CarelHassink.
Take a look at his facebook account, there you can see that he offers different batteries. Very professional, excellent packaging.
A respectable seller.
A 24kWh Nissan Gen2 pack consists of 48 cells. My plan was to build 7S7P, so I needed another single cell. Luckily the seller had an additional cell. Plan your battery layout before you buy. This was my first experience with Nissan cells, the Gen2. They are simple to work with and to set up.
Try to find a good pack with little degradation, that may take some time.
@Carel
I hope that you are fine when I write your name here, but it was a pleasure dealing with you.